diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9748490..475de5c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10"]
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-10.15]
       fail-fast: false
 
     steps: